Over time as I started to make videos I found the sound quality was bugging me.
So I embarked on a mini-quest to improve on the audio I was capturing.
Eventually ending up with four external mics and the internal camera mic
(I also have a few studio mics but that is for another time.)

Here is a video I made while recording from all 5 sources at the same time in a couple of different locations..
(Editing that into a single video was quite a chore!)

Summary of my findings

Camera Internal mic

Cost: free, built in to most cameras.Power: internal camera batteryPros: free, always have it with you.Cons: usually terrible poor quality sound, picks up wind, environment and even camera internal operating noises.

Apex 182

Cost: runs around 20$us/26$cdnPower: none.Pros: Needs no battery, and is stereo, very inexpensive.Cons: no easy way to clip it to anything. output levels are low.

Audio-Technica ATR3350

Cost: runs around 29$us/50$cdnPower: needs a LR44 type battery that lasts about 10-15 hours.Pros: cheap, not bad soundCons: no battery life indicator, you never know if it has quit on you.
excessively 6 meter/20 foot long ever tangle cord.

RØDE smartlav+

Cost: runs around 89$us/99$cdnPros: powers itself from the recording device (needs to be compatible), small easily placed.Cons: None, it does need a RØDE SC3 3.5mm TRRS to TRS Adapter to connect to recorders instead of smartphonesHint: A kit with the lav and adapter can sometimes be found for almost same price as lav by itself, much more expensive if bought separately